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safety chain



safety chain,  
     A normally slack chain for preventing excessive movement between a truck and a car body in sluing.  [Webster 1913 Suppl.]
Safety arch (Arch.), a discharging arch. See under Discharge, v. t. -- Safety belt, a belt made of some buoyant material, or which is capable of being inflated, so as to enable a person to float in water; a life preserver. -- Safety buoy, a buoy to enable a person to float in water; a safety belt. -- Safety cage (Mach.), a cage for an elevator or mine lift, having appliances to prevent it from dropping if the lifting rope should break. -- Safety lamp. (Mining) See under Lamp. -- Safety match, a match which can be ignited only on a surface specially prepared for the purpose. -- Safety pin, a pin made in the form of a clasp, with a guard covering its point so that it will not prick the wearer. -- Safety plug. See Fusible plug, under Fusible. -- Safety switch. See Switch. -- Safety touchdown (Football), the act or result of a player's touching to the ground behind his own goal line a ball which received its last impulse from a man on his own side; -- distinguished from touchback. See Touchdown. Same as safety -- Safety tube (Chem.), a tube to prevent explosion, or to control delivery of gases by an automatic valvular connection with the outer air; especially, a bent funnel tube with bulbs for adding those reagents which produce unpleasant fumes or violent effervescence. -- Safety valve, a valve which is held shut by a spring or weight and opens automatically to permit the escape of steam, or confined gas, water, etc., from a boiler, or other vessel, when the pressure becomes too great for safety; also, sometimes, a similar valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, to prevent collapse.
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